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CVE-2026-92019

Mitigation bypass in the Remote Settings Client component

HIGH
8.1
CVSS Score
Published: September 15, 2026 at 12:33 PM UTC
Updated: October 6, 2026 at 02:40 PM UTC
2 products affected across 1 vendorFirefoxThunderbird

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Severity
HIGH8.1
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

Mitigation bypass in the Remote Settings Client component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, and Firefox ESR 153.3.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Firefox· Mozilla
95%
v < 115.41.0116.0 ≤ v < 140.16.0141.0 ≤ v < 153.3.0154.0.0 ≤ v < 156.0.0
Vendor states this is fixed in 115.41 (unaffected)
Affected range stops below 115.41.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 140.16 (unaffected)
Affected range stops below 140.16.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 153.3 (unaffected)
Affected range stops below 153.3.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 156 (unaffected)
Affected range stops below 156.0.0, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 140.16.0141.0 ≤ v < 153.3.0154.0 ≤ v < 156.0
Vendor states this is fixed in 140.16 (unaffected)
Affected range stops below 140.16.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 153.3 (unaffected)
Affected range stops below 153.3.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 156 (unaffected)
Affected range stops below 156.0, so it looks safe — our inference, not a vendor statement

References (8)

Permissions Required
Source: cverecord
https://bugzilla.mozilla.org/show_bug.cgi?id=2065636
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-90/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-91/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-92/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-93/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-95/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2026-94/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-96/

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.1HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-693

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